Lin Mu, 23 years old, is a graduate student in the history department of a certain 985 university. He specializes in the military history of the Warring States Period. His tutor is a domestic authority on the Changping War. The title of the thesis is "Re-examination of the terrain of the Battle of Changping - Based on field survey and literature comparison". While inspecting the ancient battlefield site in Changping, I found half a bronze spear in a patch of grass by the Danshui River. The moment I touched it, the ancient jade resonated, making the world spin. When I woke up, it was already 260 BC, in the mansion of Zhao Kuo in Handan. Travel through the story of Zhao Kuo defeating Bai Qi and winning the Battle of Changping.